基于余数系统的OFDM无损峰均比抑制方法.pdf

文档介绍：of University of Electronic Science and Technology of ChinaSep. 2013 基于余数系统的OFDM无损峰均比抑制方法姚毅,胡剑浩,马上(电子科技大学通信抗干扰技术国家级重点实验室成都611731)【摘要】正交频分复用(OFDM)传输方法输出信号由多个子信道叠加而成,会产生较高的峰均比。提出一种基于余数系统的峰均比抑制方法,利用余数系统并行、余数小于对应余数基的特性,从信号前端入手控制OFDM传输信号的动态范围,有效利用放大器的线性动态范围,防止非线性失真的产生,达到无损抑制峰均比的目的。与传统的OFDM相比,峰均比抑制性能提高5 dB以上,并推导出该方法与OFDM传输带宽关系的表达式,分析得出在OFDM的信噪比大于0的前提下,该方法占用的传输带宽更小。关键词正交频分复用; 并行传输; 峰值平均功率比; 余数系统中图分类号TN914文献标志码A doi:.1001- Residue Number System Based OFDM Methodfor Lossless PAPR ReductionYAO Yi, HU Jian-hao, and MA Shang (The National Key Lab of Science and Technology munication, University of Electronic Science and Technology of ChinaChengdu 611731)AbstractThe main limitation of Orthogonal Frequency Division Multiplexing (OFDM)-basedtransmission systems isthe high Peak-to-Average Power Ratio (PAPR) of thetransmitted signals. This paper proposes a residue number system (RNS) based OFDM transmissionmethod. This method can achieve lossless PAPR reductionby using the features of RNS to controldynamic range of the transmitted signals and to avoid nonlinear distortion. Numerical resultsshow that the proposedmethod offers PAPR performance improvement at least 5 dB and takes less transmission bandwidth when the SNR of OFDM is above 0 dB, compared with the original words orthogo